diff --git a/index.html b/index.html
index ee115ea5..f6548a60 100644
--- a/index.html
+++ b/index.html
@@ -52,6 +52,7 @@
                 <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.4.8/addons/p5.dom.js"></script>
                 <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.4.8/addons/p5.sound.js"></script>
 		<script src="sketches/scintillating_grid.js"></script>
+		<script src="sketches/sketch_with_move.js"></script>
 		<script src="lib/js/head.min.js"></script>
 		<script src="js/reveal.js"></script>
 
diff --git a/sketches/sketch_with_move.js b/sketches/sketch_with_move.js
new file mode 100644
index 00000000..59d96d29
--- /dev/null
+++ b/sketches/sketch_with_move.js
@@ -0,0 +1,100 @@
+var sketchBreathing = function( p ) {
+	var canvas, squarewidth, canvasWidth, canvasHeight, angle, a, b, c;
+    p.setup = function() {
+		canvasWidth = 350;
+		canvasHeight = 350;
+		canvas = p.createCanvas(canvasWidth, canvasWidth);
+		canvas.parent('breathing_id');
+		//Stroke properties
+		p.noStroke();
+		p.smooth();
+
+		//Initialization
+		div = p.createDiv('<br><h5>Breathing Square</h5><br>Move the slider to change squares size');
+		div.id("sliders");
+		div.parent('breathing_id')
+
+		squarewidth_slider = p.createSlider(0, 175, 150);
+		squarewidth_slider.position(400, 600);
+		squarewidth_slider.parent("sliders")
+
+		a = Math.floor((Math.random() * 255) + 0);
+		b = Math.floor((Math.random() * 255) + 0);
+		c = Math.floor((Math.random() * 255) + 0);    
+    };
+
+    p.draw = function() {
+        canvas.background(210);
+		var squarewidth = squarewidth_slider.value()
+		//fill with random color
+		p.fill(a, b, c);
+
+		p.push()
+		//fill with inverse color
+		p.fill(255-a, 255-b, 255-c);
+		//Translate the rotation to the center of the canvas
+		p.translate(canvasWidth/2, canvasHeight/2);
+		p.rotate(p.frameCount / 30.0);
+		//Translate the square to the center
+		p.translate(-125,-125);
+		p.rect(0, 0, 250, 250);
+		p.pop()
+
+		//Draw the 4 squares
+		p.rect(0, 0, squarewidth, squarewidth);
+		p.rect(canvasWidth-squarewidth, 0, squarewidth, squarewidth);
+		p.rect(0, canvasHeight-squarewidth, squarewidth, squarewidth);
+		p.rect(canvasWidth-squarewidth, canvasHeight-squarewidth, squarewidth, squarewidth);
+  };
+};
+
+var sketchStepping = function( p ) {
+	var canvas, canvasWidth, canvasHeight;
+	var a=80;
+	var b=40;
+	var s=0;
+
+	p.setup = function() {
+		canvasWidth = 800;
+		canvasHeight = 320;
+		canvas = p.createCanvas(canvasWidth, canvasHeight);
+		canvas.parent('stepping_id');
+		div = p.createDiv('<br><h5>Stepping feet</h5>');
+		div.parent('stepping_id')
+	};
+
+	p.draw = function(){
+		p.background(255);
+		if (b>=p.height-a/2) {
+			s=1;
+		}
+		if (b==a/2) {
+			s=0;
+		}
+		if (s==0) {
+			b++;
+		}else {
+			b--;
+		}
+		//Stripes
+		p.rectMode(p.CORNER);
+		p.noStroke();
+		p.fill(0);
+		if(p.mouseIsPressed == false) {
+	  		for (var y=0; y<300; y=y+40) {
+				p.rect(0, y, 800, 20);
+			}	
+		}
+		//Squares
+		p.rectMode(p.CENTER);
+		p.fill(0, 0, 30);
+		p.rect(320, b, a, a);
+		p.rect(640, b, a, a);
+		p.fill(255, 255, 0);
+		p.rect(160, b, a, a);
+		p.rect(480, b, a, a);
+	};
+};
+
+var myp5_1 = new p5(sketchBreathing);
+var myp5_2 = new p5(sketchStepping);
\ No newline at end of file
diff --git a/source.md b/source.md
index a8322fa9..5df2cd93 100644
--- a/source.md
+++ b/source.md
@@ -594,6 +594,18 @@ V:
     <figcaption>Positron imagery</figcaption>
 </figure>
 
+V:
+
+## Optical Illusions (others)
+
+<div id='breathing_id'></div>
+
+V:
+
+## Optical Illusions (others)
+
+<div id='stepping_id'></div>
+
 H:
 
 ## References